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Write a C program named toupper.c that reads the contents of a file, and writes to another file after changing all lowercase letters in the input file to uppercase.

Question:


Write a C program named toupper.c that reads the contents of a file, and writes to another file after changing all lowercase letters in the input file to uppercase.

 

  • The name of the input file and the output file are to be passed as  command line arguments.
  • Assume there are only ASCII characters in the input file.
  • The length of the input file is not known beforehand. So make sure your program keeps reading bytes until EOF is reached.
  • Use the library function toupper to concert letters into uppercase.

 

Example:

The program is run from the command line as follows;

C:\>toupper.exe infile.txt outfile.txt

Suppose the contents of the input file infile.txt is:

AbcdefG

The contents of the output file outfile.txt should be:

ABCDEFG


Answer:


Step 1

Program plan:

  • Create two next files infile.txt and outfile.txt 
  • enter the content in infile.txt
  • Write a code in C using C compiler a save as  toupper.exe
  • In the code include all the necessary header files .
  • In the main method create two file pointers
  • if two files fp1 and fp2 are Null then it will show file cannot open.
  • otherwise the control moves to the do loop were to upper() function is used to convert the contents of infile.txt to uppercase and print the  content of outfile.txt 
  • Run the code in command prompt type C:\>toupper.exe infile.txt outfile.txt
  •  the output  is obtained as shown in step 3

 

Step 2

Program:

#include<stdio.h>

#include<stdlib.h>

#include<process.h>

 void main() {

   FILE *fp1, *fp2;

   char a;

   clrscr();

   fp1 = fopen("infile.txt", "r");

   if (fp1 == NULL) {

      puts("cannot open this file");

      exit(1);

   }

   fp2 = fopen("outfile.txt", "w");

   if (fp2 == NULL) {

      puts("Not able to open this file");

      fclose(fp1);

      exit(1);

   }

 do {

      a = fgetc(fp1);

      a = toupper(a);

      fputc(a, fp2);

   } while (a != EOF);

 fcloseall();

 getch();

}

Step 3

Output:

C:\>toupper.exe infile.txt outfile.txt

 infile.txt

 hi

 outfile.txt

HI 

ST

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